src/common/unichar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/unichar.cpp
   3 // Purpose:     wxUniChar and wxUniCharRef classes
   4 // Author:      Vaclav Slavik
   5 // Created:     2007-03-19
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2007 REA Elektronik GmbH
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ===========================================================================
  12 // headers
  13 // ===========================================================================
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #ifdef __BORLANDC__
  19     #pragma hdrstop
  20 #endif
  21
  22 #ifndef WX_PRECOMP
  23     #include "wx/strconv.h"  // wxConvLibc
  24 #endif
  25
  26 #include "wx/unichar.h"
  27 #include "wx/stringops.h"
  28
  29 // ===========================================================================
  30 // implementation
  31 // ===========================================================================
  32
  33 // ---------------------------------------------------------------------------
  34 // wxUniChar
  35 // ---------------------------------------------------------------------------
  36
  37 /* static */
  38 wxUniChar::value_type wxUniChar::From8bit(char c)
  39 {
  40     // all supported charsets have the first 128 characters same as ASCII:
  41     if ( (unsigned char)c < 0x80 )
  42         return c;
  43
  44     wchar_t buf[2];
  45     if ( wxConvLibc.ToWChar(buf, 2, &c, 1) != 2 )
  46         return wxT('?'); // FIXME-UTF8: what to use as failure character?
  47     return buf[0];
  48 }
  49
  50 /* static */
  51 char wxUniChar::To8bit(wxUniChar::value_type c)
  52 {
  53     // all supported charsets have the first 128 characters same as ASCII:
  54     if ( c < 0x80 )
  55         return c;
  56
  57     wchar_t in = c;
  58     char buf[2];
  59     if ( wxConvLibc.FromWChar(buf, 2, &in, 1) != 2 )
  60         return '?'; // FIXME-UTF8: what to use as failure character?
  61     return buf[0];
  62 }
  63
  64
  65 // ---------------------------------------------------------------------------
  66 // wxUniCharRef
  67 // ---------------------------------------------------------------------------
  68
  69 #if wxUSE_UNICODE_UTF8
  70 wxUniChar wxUniCharRef::UniChar() const
  71 {
  72     return wxStringOperations::DecodeChar(m_pos);
  73 }
  74
  75 wxUniCharRef& wxUniCharRef::operator=(const wxUniChar& c)
  76 {
  77     wxStringOperations::Utf8CharBuffer utf(wxStringOperations::EncodeChar(c));
  78     size_t lenOld = wxStringOperations::GetUtf8CharLength(*m_pos);
  79     size_t lenNew = wxStringOperations::GetUtf8CharLength(utf[0]);
  80
  81     if ( lenNew == lenOld )
  82     {
  83         iterator pos(m_pos);
  84         for ( size_t i = 0; i < lenNew; ++i, ++pos )
  85             *pos = utf[i];
  86     }
  87     else
  88     {
  89         size_t idx = m_pos - m_str.begin();
  90
  91         m_str.replace(m_pos, m_pos + lenOld, utf, lenNew);
  92
  93         // this is needed to keep m_pos valid:
  94         m_pos = m_str.begin() + idx;
  95     }
  96
  97     return *this;
  98 }
  99 #endif // wxUSE_UNICODE_UTF8